Alloy Names (as per RoHS specifications)
IS/ISO CuSn4
DIN CEN/TS 13388 CW450K
UNS C51100
JIS C51100
Chemical Composition Weight percentage
Tin [Sn] 3.5 % to 4.5%
Phosphorus [P] 0.03% to 0.35%
Zinc [Zn] 0.30% Maximum
Lead [Pb] 0.05 % Maximum
Copper [Cu] Remainder %
Characterists
  • Possessing excellent mechanical strength along with desirable ductility for sheet metal processing.
  • Provides an excellent combination of strength, excellent formability and hardness.
  • Good electrical conductivity and corrosion resistance.
  • Excellent Soldering and brazing properties.
Main Applications
Electrical : Contact Springs,Relais Springs,Terminals,Switch Parts Fuse Clips,Electronic connectors.
Fasteners : Lock Washers,Fasteners.
Industrial : Textile Machinery,perforated Sheets,Springs,Sleeve Bushing,Clutch Disks.
General : Stamped parts,Connectors,Contact Springs,spring Elements,Ultra high strength spring elements,Fixed contacts.

Properties

Density 8.85 g/cm3
Thermal expansion coefficient - 191..16 17.8 10-6/K
0..300°C 18.1 10-6/K
Specific heat capacity 0.377 J/(g·K)
Thermal Conductivity 100 W/(m·K)
Electrical Conductivity (1 MS/m = 1 m/(O mm²) ≥ 11 MS/m
Electrical Conductivity (IACS) ≥ 19 %
Thermal coefficient of electrical resistance (0..200 C) 0.1 10-3/K
Modulus of elasticity (1 Gpa = 1 kN/mm²) cold formed 110 Gpa
120 Gpa
Temper Tensile Strength Yield Strength Elongation Minimum Hardness HV
Rm Rp0.2 A50mm
MPa(N/mm2) MPa(N/mm2) %
O (Soft) 295 Min ≤ 190* 40 Min 80 Max
HA (Quater Hard) 340 Min ≥ 320 30 Min 100 Min
HB (Half Hard) 430 Min ≥ 440 8 Min 150 Min
HD (Hard) 510 Min ≥ 480 4 Min 175 Min
HE (Extra Hard) 620 Min ≥ 560 2 Min 180 Min
HS (Spring Hard) 650 Min ≥ 620 200 Min

Request a quote

Download The Corporate Brochure